Kahn and Rachelle Horowitz, two students who had joined the YSL at Brooklyn College in the mid-1950s. They had helped organize several important civil rights demonstrations with the aid of Bayard Rustin, including the 1957 Prayer Pilgrimage to Washington and the 1958 and 1959 Youth March for Integrated Schools. In 1960 YPSL members played important roles organizing pickets at local Woolworths in support of the Southern sit-ins and protesting the arrival of the HUAC to the San Francisco Bay area. Within the SP-SDF and the YPSL, Max Shachtman's group was known as the "realignment tendency" because Shachtman increasingly felt that it was better for the Socialists to create a realignment within the Democratic Party consisting of the AFL-CIO, African Americans and liberals. It was also anti-communist. When Shachtman made a speech supporting the Bay of Pigs Invasion in April 1961 to the Berkeley chapter of the Socialist Party, the local YPSL chapter withdrew his invitation to speak the following day. Domestically they were against working with Stalinists. Besides the "realignment tendency", YPSL contained more traditional "third camp" socialists, which maintained the politics that Shachtman had formulated in the late 1940s. This was called the "labor party tendency" because they favored a labor party on the British model, rather than a strategy of reforming the Democratic Party as a socialist party. During this period the YPSL worked within other groups, such as the Student Peace Union and the Students for a Democratic Society, but their internal factionalism got in the way. Mike Parker, a yipsel of the labor party faction, had become the group's national secretary in 1960, and other yipsels poured into the SPU, where they also recruited new members. This helped to give the SPU's ideology a "Third Camp" orientation that held both the west and the USSR responsible for nuclear proliferation. Its most popular slogan was "No Test! East or West!". However, the SPU was a base for the labor-party faction within the YPSL and the realignment tendency sought to having it merge with Student SANE to dilute their influence. This idea was defeated by Parker, but the intense YPSL factionalism within the SPU continued until the group disbanded in spring 1964. YPSL was hostile to the new SDS "activist" approach in 1960; they were wary that it would become another "protest group" and compete with them within the civil rights movement. They were briefly successful in getting